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Applied Mathematics · 2023 · 1 mark
CBSE 2023 · Central · Set 4 · Q7
A and B are square matrices each of order 3 such that | A |=-1 and | B |=3. What is the value of |3 AB |?
A and B are square matrices each of order $\displaystyle 3$ such that $\displaystyle |\mathrm{A}|=-1$ and $\displaystyle |\mathrm{B}|=3$. What is the value of $\displaystyle |3 \mathrm{AB}|$?
Official answer
(D)
$\displaystyle -81$
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CBSE Class 12 Applied Mathematics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.